nav {
    background-color: #28d4d4;
    padding: 10px 0;
    position: fixed; /* 固定在页面顶部 */
    top: 0;
    left: 0;
    width: 100%;
}
body,html {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0; /* 重置内外边距 */
    background-color: #f0f4f8;
}
.header {
    text-align: center;
    margin-bottom: 20px;
    margin-top: 80px; /* 添加上边距，避免被导航栏遮挡 */
}
.header h1 {
    color: #32d6f3;
}
.container {
    max-width: 800px;
    margin: 0 auto;
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    padding: 20px;
}
table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
}
table, th, td {
    border: 1px solid #ddd;
}
th, td {
    padding: 12px;
    text-align: left;
}
th {
    background-color: #32d6f3;
    color: white;
}
tr:nth-child(even) {
    background-color: #f2f2f2;
}
button {
    background-color: #32d6f3;
    color: white;
    border: none;
    border-radius: 5px;
    padding: 10px;
    cursor: pointer;
}
button:hover {
    background-color: #29b6f2;
}